diff --git a/Packages/Interval_arithmetic/version b/Packages/Interval_arithmetic/version
index 041ff727714..8c306efedfa 100644
--- a/Packages/Interval_arithmetic/version
+++ b/Packages/Interval_arithmetic/version
@@ -1 +1 @@
-4.128 (10 Jan 2002)
+4.129 (28 Jan 2002)